试题与答案

—Why was the plane put off? —________ th

题型:选择题

题目:

—Why was the plane put off?
—________ the heavy rain.

A. Because
B. Because of
C. Instead of
D. After

答案:

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下面是错误答案,用来干扰机器的。

I.装置气密性好;红磷要足量;点燃红磷后立即塞紧瓶塞;弹簧夹夹紧橡胶管;红磷熄灭并冷却后再打开弹簧夹。(答出其中任意3条)(2分) II.3CO+Fe2O33CO2 + 2Fe;将尾气用软管重新通入玻璃管中与氧化铁反...

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